ATP Automotive AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle,1-Pack

Okay, where do we begin. I bought my vehicle from a dealer who bought it from an insurance lot. Something has fallen onto the vehicle and crashed the hood and the surrounding areas. But the engine bay was untouched. The vehicle sat at the insurance lot for about 6 months without being started. Once the dealer purchased it he took it to a body shop where they fixed all the body panels the hood etc. Then when they try to sell the vehicle they had a hard time selling it because it was a six-speed manual transmission. So it's sad at the dealership for another 4 months. Now all this sitting and not running caused the rear main seal to dry out. After I purchased the vehicle about 3 months into driving a substantial leak happened at the rear main seal where I was losing about half a quart of oil a week. Took it to the dealership the estimate to fix it was around $3,800. Called a independent mechanic it was about 2800 to $3,000 to fix it. I just did not have that amount of money to throw at it. So I started searching online and stumbled upon AT205. Now before I purchased this product I did my due diligence did the research watched the video of the manufacturer. Educated myself and how is this product different from any other stop leak product. And where I was sold was that this product did not swell the seals but what it did was or what it does is it rejuvenates and restores the elasticity and the plasticity of the seals due to the plasticizers and plastic stabilizers that this product contains. So I bought it. The product arrived quickly, and as quickly as it did arrive I poured it into my engine. I mean what's the worst that can happen, it doesn't work right. I followed the instructions drove the car around for about 30 minutes to let everything mix in. And then it was time to drive and get about 5 hours of driving time. It took about 5 days of commuting back and forth to work to get those 5 hours in. After about 3 hours I noticed when I would stop at a parking spot for extended period of time and I would move my vehicle instead of having 10 drops of oil under the engine I would have three or four. After about 5 to 7 hours of driving The only oil left was the residual oil on the bottom of the engine that I have not wiped off yet because a car is too low to the ground. It's been about 2 weeks now and I have zero drips of oil under my car. Fresh oil that is. At my house in the driveway I still do have the oil spots from the leak that were there before I use this product. As of now there are dried out and everyday I check for new spots and I see any. I'm highly satisfied with this product and what it has done thus far. How is it going to work in the future I don't know. Will the oil leak come back with my next oil change not sure. But what I do know as of right now there's no leak. I'm thinking about buying another bottle and add it with my next oil change just to be sure that those seals get the love that they need to be able to seal the engine properly for a long time to come. One thing I'm going to do is, I will update this review a year from today. If you have a car that has a front main or rear main seal leak or any other leak when your engine try this product out it might just save you hundreds of dollars that you may or may not have. Yes I highly recommend this product to anybody that has a engine leak.

I was having a minor oil leak in my 07 Civic. I also rubbed down the hoses in my engine compartment. It's great for preventative maintenance. My car is 19 years old and has no leaks whatsoever.

I bought a used Tundra with 140K miles on it that I knew had a leaking rear main seal. It was a $1000 repair if you get a really great deal. I ended up getting the truck for a really good price and was prepared to get the rear main seal fixed. I ended up putting it off and it was going through a bout a quart of oil in 5000 miles. I wasn't worried. Some German cars tell you going through a quart every 800 miles is normal. WTF? My old truck had the transmission go out on the road and I had to get it rebuilt by AAmco. They convinced me to replace the rear main seal while the transmission was out even though it wasn't leaking. I continued my trip, had the transmission checked out as required. I was informed then that the new rear main seal was leaking. On my way home I stopped at the Aamco transmission shop to get it fixed under warranty. Unfortunately it was Saturday. They told me I would have to stick around for 2-3 days but they would fix it for free. They also told me that I could just get it fixed at an AAmco near home. This turned out to not be true. The Aamco near home wanted another $1200 to replace it. I wasn't going to pay another $1200 after just paying $3500 to for the trans rebuild. I ended up putting some stop leak product in the Transmission. It slowed it down but never completely stopped it. After getting a few estimates to get the rear Main seal replaced I decided to look into Transmission Stop Leak again. I found this product and it seemed better than what I had used previously and that worked OK. I put it in according to instructions and drove around with it until my next oil change was due. I took it to a local Toyota dealership which had very reasonable oil change prices, only about 5 dollars more than it would cost me to buy the oil and filter. Tundras take 8 qts of Full synthetic. They confirmed that I needed a rear main seal. I asked them what about putting Stop Leak in the Transmission. They told not to do that because there was a good chance it would ruin the transmission. Well too late I had already used it. I decided to wait and see what would happen because it had only used 1 quart between oil changes. Oil is a lot cheaper than replacing the rear main seal. I am so glad I did because as per their instructions before I went back for the next oil change I cleaned the motor off really well with degreaser and a pressure washer. This time they told me that it wasn't the rear main seal that was leaking but the Cam Towers. This was goin go be $4200 to fix. Since it was using less oil I decided to wait a little longer to see what happened. The bottom line is AT-205 RE-Seal didn't ruin my motor. It did stop the oil leaks though. Toyota told me I had very slight weepage around my valve cover gaskets but never either of the other 2 oil leaks again. I can only assume they thought I got them fixed. I cleaned up the under carriage a few more times to check on things and was amazed at how well this product worked to soften up those seals to stop the oil leaks. I now have more than 180k miles on the Tundra and the only time it uses oil is towing a trailer at 70-80 mph for long trips. This product is a bit more expensive than some of the brands but in my opinion well worth it.

2009 Impala 3.5L V6 developed a power steering leak from the passenger side rack and pinion seal in September 2025. This was manageable until November when the leak started to get so bad that I could go on a 30-mile round trip, and after getting back my power steering reservoir would be almost empty. I could feel the power steering going hard as I was driving, and it was leaking fluid all over the subframe and onto the ground. With the car on jack stands and running, you could literally see fluid dripping onto the ground. I had also heard of this product from Scotty Kilmer and a few other people. I put only about 1.5 oz of this stuff in. I've driven almost 1200 miles since then, and this stuff really does work very well. Many days I'll come home and there will be effectively zero fluid loss. It usually takes me about 3 weeks for the reservoir level to be close enough to the "low" line that I don't want to risk running the pump dry, and so I'll add fluid then. Mind you - this Impala has a pretty small reservoir capacity, so we're talking a few ounces of fluid at most. I have no doubt that this product could also fix a small oil leak from the valve cover and oil pan gaskets on this car. Project Farm, scientific car channel, tested oil "stop leak" products, and AT-205 was THE best in restoring worn rubber seals to their original thickness. Also keep in mind that power steering systems are probably the least likely to benefit from this product, and it's worked very well for me. This product is not going to help you if you have an obvious tear in the seal. It can't mend two broken bits of rubber back together. But if your seals are just old and shrunken like mine are on a 17-year-old GM product with 150,000 miles in Ohio weather, this stuff is well worth the money to at least try it and see if it works - and if it doesn't, then you know you have a bigger problem on your hands.

Our 2006 Itasca/Winnebago Class A has four massive hydraulic jacks for leveling and stabilization that were leaking at the seals when we bought it in spring of 2025. Previous owner said the problem was especially bad when the RV was stored with jacks down over winter. The problem got really ugly when I discovered that the jacks were no longer available and would need to be replaced entirely, unless I wanted to attempt an undocumented seal replacement science experiment. Replacing the entire set would have cost $8,000 and (wait for it) ther'd be NO WARRANTY unless I replaced the pump and control valve body at the same time! I tend to be skeptical of 'repair juice' -- but just one bottle of this in the 2 gallon main reservoir (and about twenty cycles later) the leaks had stopped completely -- the rams were totally dry! The acid test came when we put it away in November, left it on the jacks and now six months later there has been absolutely ZERO leakage despite winter temperatures down to minus 26 degrees! The pump runs smoother and the system works like new. I will use this stuff in ANY hydraulic system at the first sign of wetness at the seals.

Excellent. Resolved issue with leaking output seal on transfer case. Had to drive it ~100 miles to get the plasticizers to absorb into the seal. No issues. Also great that it doesn’t mess with the additive packages or the viscosity of the gear oil too

ATP Automotive AT-205 Re-Seal offers only average value as a quick-fix solution. While it initially works to rejuvenate rubber seals and stops leaks for awhile, the effects are unfortunately temporary, and the leaks eventually return once the formula wears out. Given the price, it doesn’t provide a permanent solution for aging components, making it a frustrating investment. Because it lacks long-term reliability and failed to fix the issue permanently, I don't think I'll purchase this again. Ultimately, this product earns a negative rating from me; save your money for proper mechanical repairs instead of relying on this temporary patch.

Honestly I was very skeptical. Had a rear main seal leak in a 2011 Mazda Miata and was quoted over $1500 just to diagnose it because you have to disassemble the rear of the engine. I figured for the price it couldn’t hurt to try it. Went from getting 4-5 drops of oil in the driveway every night to nothing in just 30 min of run time. Worked great and saved a fortune, I highly recommend. Just remember to calculate the correct volume based on the capacity of your oil pan. Super easy to use and worked wonders!

Parece que funciona, por el momento no pierde aceite de motor

used half the bottle as that works for my just over 4L tank - stopped the leak in my 95 saab aero (2003) - would have cost me $3500 to fix a stupid $10 seal between the head and transmission otherwise. seems like I will be able to pass inspection now!

Alles ok

Si regenera los sellos, es mejor que los selladores q hacen todo mas espeso

Original and Genuine